12c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent/* 22c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * Copyright (C) 2004-2010 NXP Software 32c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * Copyright (C) 2010 The Android Open Source Project 42c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * 52c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * Licensed under the Apache License, Version 2.0 (the "License"); 62c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * you may not use this file except in compliance with the License. 72c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * You may obtain a copy of the License at 82c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * 92c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * http://www.apache.org/licenses/LICENSE-2.0 102c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * 112c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * Unless required by applicable law or agreed to in writing, software 122c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * distributed under the License is distributed on an "AS IS" BASIS, 132c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 142c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * See the License for the specific language governing permissions and 152c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent * limitations under the License. 162c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent */ 172c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 182c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent#include "BIQUAD.h" 192c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent#include "FO_1I_D32F32Cll_TRC_WRA_01_Private.h" 202c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent#include "LVM_Macros.h" 212c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 222c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 232c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent/************************************************************************** 242c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ASSUMPTIONS: 252c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent COEFS- 262c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[0] is A1, 272c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[1] is A0, 282c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->coefs[2] is -B1, these are in Q31 format 292c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 302c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent DELAYS- 312c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[0] is x(n-1)L in Q0 format 322c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[1] is y(n-1)L in Q0 format 332c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent***************************************************************************/ 342c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 352c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurentvoid FO_1I_D32F32C31_TRC_WRA_01( Biquad_Instance_t *pInstance, 362c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT32 *pDataIn, 372c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT32 *pDataOut, 382c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT16 NrSamples) 392c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent { 402c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT32 ynL,templ; 412c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent LVM_INT16 ii; 422c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent PFilter_State pBiquadState = (PFilter_State) pInstance; 432c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 442c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent for (ii = NrSamples; ii != 0; ii--) 452c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent { 462c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 472c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 482c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent PROCESSING OF THE LEFT CHANNEL 492c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 502c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL=A1 (Q31) * x(n-1)L (Q0) >>31 in Q0 512c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[0],ynL,31) 522c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 532c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL+=A0 (Q31) * x(n)L (Q0) >> 31 in Q0 542c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent MUL32x32INTO32(pBiquadState->coefs[1],*pDataIn,templ,31) 552c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL+=templ; 562c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 572c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent // ynL+= (-B1 (Q31) * y(n-1)L (Q0) ) >> 31 in Q0 582c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent MUL32x32INTO32(pBiquadState->coefs[2],pBiquadState->pDelays[1],templ,31) 592c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ynL+=templ; 602c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 612c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 622c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent UPDATING THE DELAYS 632c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 642c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[1]=ynL; // Update y(n-1)L in Q0 652c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0 662c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 672c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent /************************************************************************** 682c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent WRITING THE OUTPUT 692c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent ***************************************************************************/ 702c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent *pDataOut++=(LVM_INT32)ynL; // Write Left output in Q0 712c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent } 722c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 732c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent } 742c8e5cab3faa6d360e222b7a6c40a80083d021acEric Laurent 75